text: /*! \file ssl/ssl_conf.c
   *  \brief SSL configuration functions
   */
  /* ====================================================================
   * Copyright (c) 2012 The OpenSSL Project.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer. 
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. All advertising materials mentioning features or use of this
   *    software must display the following acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    openssl-core@openssl.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   * ====================================================================
   *
   * This product includes cryptographic software written by Eric Young
   * (eay@cryptsoft.com).  This product includes software written by Tim
   * Hudson (tjh@cryptsoft.com).
   *
   */
  
  #ifdef REF_CHECK
  #  include <assert.h>
  #endif
  #include <stdio.h>
  #include "ssl_locl.h"
  #include <openssl/conf.h>
  #include <openssl/objects.h>
  #ifndef OPENSSL_NO_DH
  #include <openssl/dh.h>
  #endif
  
  /* structure holding name tables. This is used for pemitted elements in
   * lists such as TLSv1 and single command line switches such as no_tls1
   */
  
  typedef struct
  	{
  	const char *name;
  	int namelen;
  	unsigned int name_flags;
  	unsigned long option_value;
  	} ssl_flag_tbl;
  
  /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  #define SSL_TFLAG_INV	0x1
  /* Flags refers to cert_flags not options */
  #define SSL_TFLAG_CERT	0x2
  /* Option can only be used for clients */
  #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  /* Option can only be used for servers */
  #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
  #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
  
  #define SSL_FLAG_TBL(str, flag) \
  	{str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
  #define SSL_FLAG_TBL_SRV(str, flag) \
  	{str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
  #define SSL_FLAG_TBL_CLI(str, flag) \
  	{str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
  #define SSL_FLAG_TBL_INV(str, flag) \
  	{str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
  #define SSL_FLAG_TBL_SRV_INV(str, flag) \
  	{str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
  #define SSL_FLAG_TBL_CERT(str, flag) \
  	{str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
  
  /* Opaque structure containing SSL configuration context.
   */
  
  struct ssl_conf_ctx_st
  	{
  	/* Various flags indicating (among other things) which options we
  	 * will recognise.
  	 */
  	unsigned int flags;
  	/* Prefix and length of commands */
  	char *prefix;
  	size_t prefixlen;
  	/* SSL_CTX or SSL structure to perform operations on */
  	SSL_CTX *ctx;
  	SSL *ssl;
  	/* Pointer to SSL or SSL_CTX options field or NULL if none */
  	unsigned long *poptions;
  	/* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
  	unsigned int *pcert_flags;
  	/* Current flag table being worked on */
  	const ssl_flag_tbl *tbl;
  	/* Size of table */
  	size_t ntbl;
  	};
  
  static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
  				const char *name, int namelen, int onoff)
  	{
  	/* If name not relevant for context skip */
  	if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
  		return 0;
  	if (namelen == -1)
  		{
  		if (strcmp(tbl->name, name))
  			return 0;
  		}
  	else if (tbl->namelen != namelen || strncasecmp(tbl->name, name, namelen))
  		return 0;
  	if (cctx->poptions)
  		{
  		if (tbl->name_flags & SSL_TFLAG_INV)
  			onoff ^= 1;
  		if (tbl->name_flags & SSL_TFLAG_CERT)
  			{
  			if (onoff)
  				*cctx->pcert_flags |= tbl->option_value;
  			else
  				*cctx->pcert_flags &= ~tbl->option_value;
  			}
  		else
  			{
  			if (onoff)
  				*cctx->poptions |= tbl->option_value;
  			else
  				*cctx->poptions &= ~tbl->option_value;
  			}
  		}
  	return 1;
  	}
  
  static int ssl_set_option_list(const char *elem, int len, void *usr)
  	{
  	SSL_CONF_CTX *cctx = usr;
  	size_t i;
  	const ssl_flag_tbl *tbl;
  	int onoff = 1;
  	/* len == -1 indicates not being called in list context, just for
  	 * single command line switches, so don't allow +, -.
  	 */
  	if (len != -1)
  		{
  		if (*elem == '+')
  			{
  			elem++;
  			len--;
  			onoff = 1;
  			}
  		else if (*elem == '-')
  			{
  			elem++;
  			len--;
  			onoff = 0;
  			}
  		}
  	for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++)
  		{
  		if (ssl_match_option(cctx, tbl, elem, len, onoff))
  			return 1;
  		}
  	return 0;
  	}
  
  /* Single command line switches with no argument e.g. -no_ssl3 */
  static int ctrl_str_option(SSL_CONF_CTX *cctx, const char *cmd)
  	{
  	static const ssl_flag_tbl ssl_option_single[] =
  		{
  		SSL_FLAG_TBL("no_ssl2", SSL_OP_NO_SSLv2),
  		SSL_FLAG_TBL("no_ssl3", SSL_OP_NO_SSLv3),
  		SSL_FLAG_TBL("no_tls1", SSL_OP_NO_TLSv1),
  		SSL_FLAG_TBL("no_tls1_1", SSL_OP_NO_TLSv1_1),
  		SSL_FLAG_TBL("no_tls1_2", SSL_OP_NO_TLSv1_2),
  		SSL_FLAG_TBL("bugs", SSL_OP_ALL),
  		SSL_FLAG_TBL("no_comp", SSL_OP_NO_COMPRESSION),
  		SSL_FLAG_TBL_SRV("ecdh_single", SSL_OP_SINGLE_ECDH_USE),
  #ifndef OPENSSL_NO_TLSEXT
  		SSL_FLAG_TBL("no_ticket", SSL_OP_NO_TICKET),
  #endif
  		SSL_FLAG_TBL_SRV("serverpref", SSL_OP_CIPHER_SERVER_PREFERENCE),
  		SSL_FLAG_TBL("legacy_renegotiation", SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
  		SSL_FLAG_TBL_SRV("legacy_server_connect", SSL_OP_LEGACY_SERVER_CONNECT),
  		SSL_FLAG_TBL_SRV("no_resumption_on_reneg", SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
  		SSL_FLAG_TBL_SRV_INV("no_legacy_server_connect", SSL_OP_LEGACY_SERVER_CONNECT),
  		SSL_FLAG_TBL_CERT("strict", SSL_CERT_FLAG_TLS_STRICT),
  #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
  		SSL_FLAG_TBL_CERT("debug_broken_protocol", SSL_CERT_FLAG_BROKEN_PROTOCOL),
  #endif
  		};
  	cctx->tbl = ssl_option_single;
  	cctx->ntbl = sizeof(ssl_option_single)/sizeof(ssl_flag_tbl);
  	return ssl_set_option_list(cmd, -1, cctx);
  	}
  
  /* Set supported signature algorithms */
  static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
  	{
  	int rv;
  	if (cctx->ssl)
  		rv = SSL_set1_sigalgs_list(cctx->ssl, value);
  	/* NB: ctx == NULL performs syntax checking only */
  	else
  		rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
  	return rv > 0;
  	}
  /* Set supported client signature algorithms */
  static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
  	{
  	int rv;
  	if (cctx->ssl)
  		rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
  	/* NB: ctx == NULL performs syntax checking only */
  	else
  		rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
  	return rv > 0;
  	}
  
  static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
  	{
  	int rv;
  	if (cctx->ssl)
  		rv = SSL_set1_curves_list(cctx->ssl, value);
  	/* NB: ctx == NULL performs syntax checking only */
  	else
  		rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
  	return rv > 0;
  	}
  #ifndef OPENSSL_NO_ECDH
  /* ECDH temporary parameters */
  static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
  	{
  	int onoff = -1, rv = 1;
  	if (!(cctx->flags & SSL_CONF_FLAG_SERVER))
  		return -2;
  	if (cctx->flags & SSL_CONF_FLAG_FILE)
  		{
  		if (*value == '+')
  			{
  			onoff = 1;
  			value++;
  			}
  		if (*value == '-')
  			{
  			onoff = 0;
  			value++;
  			}
  		if (!strcasecmp(value, "automatic"))
  			{
  			if (onoff == -1)
  				onoff = 1;
  			}
  		else if (onoff != -1)
  			return 0;
  		}
  	else if (cctx->flags & SSL_CONF_FLAG_CMDLINE)
  		{
  		if (!strcmp(value, "auto"))
  			onoff = 1;
  		}
  
  	if (onoff != -1)
  		{
  		if (cctx->ctx)
  			rv = SSL_CTX_set_ecdh_auto(cctx->ctx, onoff);
  		else if (cctx->ssl)
  			rv = SSL_set_ecdh_auto(cctx->ssl, onoff);
  		}
  	else
  		{
  		EC_KEY *ecdh;
  		int nid;
  		nid = EC_curve_nist2nid(value);
  		if (nid == NID_undef)
  			nid = OBJ_sn2nid(value);
  		if (nid == 0)
  			return 0;
  		ecdh = EC_KEY_new_by_curve_name(nid);
  		if (!ecdh)
  			return 0;
  		if (cctx->ctx)
  			rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
  		else if (cctx->ssl)
  			rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
  		EC_KEY_free(ecdh);
  		}
  
  	return rv > 0;
  	}
  #endif
  static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
  	{
  	int rv = 1;
  	if (cctx->ctx)
  		rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
  	if (cctx->ssl)
  		rv = SSL_set_cipher_list(cctx->ssl, value);
  	return rv > 0;
  	}
  
  static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
  	{
  	static const ssl_flag_tbl ssl_protocol_list[] =
  		{
  		SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
  		SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
  		SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
  		SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
  		SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
  		SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2)
  		};
  	if (!(cctx->flags & SSL_CONF_FLAG_FILE))
  		return -2;
  	cctx->tbl = ssl_protocol_list;
  	cctx->ntbl = sizeof(ssl_protocol_list)/sizeof(ssl_flag_tbl);
  	return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
  	}
  
  static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
  	{
  	static const ssl_flag_tbl ssl_option_list[] =
  		{
  		SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
  		SSL_FLAG_TBL_INV("EmptyFragments", SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
  		SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
  		SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
  		SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
  		SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation", SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
  		SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
  		SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
  		SSL_FLAG_TBL("UnsafeLegacyRenegotiation", SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
  		};
  	if (!(cctx->flags & SSL_CONF_FLAG_FILE))
  		return -2;
  	if (value == NULL)
  		return -3;
  	cctx->tbl = ssl_option_list;
  	cctx->ntbl = sizeof(ssl_option_list)/sizeof(ssl_flag_tbl);
  	return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
  	}
  
  static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
  	{
  	int rv = 1;
  	if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
  		return -2;
  	if (cctx->ctx)
  		rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
  	if (cctx->ssl)
  		rv = SSL_use_certificate_file(cctx->ssl, value, SSL_FILETYPE_PEM);
  	return rv > 0;
  	}
  
  static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
  	{
  	int rv = 1;
  	if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
  		return -2;
  	if (cctx->ctx)
  		rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
  	if (cctx->ssl)
  		rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
  	return rv > 0;
  	}
  
  static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
  	{
  	int rv = 1;
  	if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
  		return -2;
  	if (!(cctx->flags & SSL_CONF_FLAG_SERVER))
  		return -2;
  	if (cctx->ctx)
  		rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
  	return rv > 0;
  	}
  
  #ifndef OPENSSL_NO_DH
  static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
  	{
  	int rv = 0;
  	DH *dh = NULL;
  	BIO *in = NULL;
  	if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
  		return -2;
  	if (cctx->ctx || cctx->ssl)
  		{
  		in = BIO_new(BIO_s_file_internal());
  		if (!in)
  			goto end;
  		if (BIO_read_filename(in, value) <= 0)
  			goto end;
  		dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
  		if (!dh)
  			goto end;
  		}
  	else
  		return 1;
  	if (cctx->ctx)
  		rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
  	if (cctx->ssl)
  		rv = SSL_set_tmp_dh(cctx->ssl, dh);
  	end:
  	if (dh)
  		DH_free(dh);
  	if (in)
  		BIO_free(in);
  	return rv > 0;
  	}
  #endif
  typedef struct
  	{
  	int (*cmd)(SSL_CONF_CTX *cctx, const char *value);
  	const char *str_file;
  	const char *str_cmdline;
  	unsigned int value_type;
  	} ssl_conf_cmd_tbl;
  
  /* Table of supported parameters */
  
  #define SSL_CONF_CMD(name, cmdopt, type) \
  	{cmd_##name, #name, cmdopt, type}
  
  #define SSL_CONF_CMD_STRING(name, cmdopt) \
  	SSL_CONF_CMD(name, cmdopt, SSL_CONF_TYPE_STRING)
  
  static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
  	SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs"),
  	SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs"),
  	SSL_CONF_CMD_STRING(Curves, "curves"),
  #ifndef OPENSSL_NO_ECDH
  	SSL_CONF_CMD_STRING(ECDHParameters, "named_curve"),
  #endif
  	SSL_CONF_CMD_STRING(CipherString, "cipher"),
  	SSL_CONF_CMD_STRING(Protocol, NULL),
  	SSL_CONF_CMD_STRING(Options, NULL),
  	SSL_CONF_CMD(Certificate, "cert", SSL_CONF_TYPE_FILE),
  	SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_TYPE_FILE),
  	SSL_CONF_CMD(ServerInfoFile, NULL, SSL_CONF_TYPE_FILE),
  #ifndef OPENSSL_NO_DH
  	SSL_CONF_CMD(DHParameters, "dhparam", SSL_CONF_TYPE_FILE)
  #endif
  };
  
  static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
  	{
  	if (!pcmd || !*pcmd)
  		return 0;
  	/* If a prefix is set, check and skip */
  	if (cctx->prefix)
  		{
  		if (strlen(*pcmd) <= cctx->prefixlen)
  			return 0;
  		if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
  			strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
  			return 0;
  		if (cctx->flags & SSL_CONF_FLAG_FILE &&
  			strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
  			return 0;
  		*pcmd += cctx->prefixlen;
  		}
  	else if (cctx->flags & SSL_CONF_FLAG_CMDLINE)
  		{
  		if (**pcmd != '-' || !(*pcmd)[1])
  			return 0;
  		*pcmd += 1;
  		}
  	return 1;
  	}
  
  static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx, const char *cmd)
  	{
  	const ssl_conf_cmd_tbl *t;
  	size_t i;
  	if (cmd == NULL)
  		return NULL;
  
  	/* Look for matching parameter name in table */
  	for (i = 0, t = ssl_conf_cmds;
  		i < sizeof(ssl_conf_cmds)/sizeof(ssl_conf_cmd_tbl); i++, t++)
  		{
  		if (cctx->flags & SSL_CONF_FLAG_CMDLINE)
  			{
  			if (t->str_cmdline && !strcmp(t->str_cmdline, cmd))
  				return t;
  			}
  		if (cctx->flags & SSL_CONF_FLAG_FILE)
  			{
  			if (t->str_file && !strcasecmp(t->str_file, cmd))
  				return t;
  			}
  		}
  	return NULL;
  	}
  
  int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
  	{
  	const ssl_conf_cmd_tbl *runcmd;
  	if (cmd == NULL)
  		{
  		SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
  		return 0;
  		}
  
  	if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
  		return -2;
  
  	runcmd = ssl_conf_cmd_lookup(cctx, cmd);
  
  	if (runcmd)
  		{
  		int rv;
  		if (value == NULL)
  			return -3;
  		rv = runcmd->cmd(cctx, value);
  		if (rv > 0)
  			return 2;
  		if (rv == -2)
  			return -2;
  		if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS)
  			{
  			SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
  			ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
  			}
  		return 0;
  		}
  
  	if (cctx->flags & SSL_CONF_FLAG_CMDLINE)
  		{
  		if (ctrl_str_option(cctx, cmd))
  			return 1;
  		}
  
  	if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS)
  		{
  		SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
  		ERR_add_error_data(2, "cmd=", cmd);
  		}
  
  	return -2;
  	}
  
  int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
  	{
  	int rv;
  	const char *arg = NULL, *argn;
  	if (pargc && *pargc == 0)
  		return 0;
  	if (!pargc || *pargc > 0)
  		arg = **pargv;
  	if (arg == NULL)
  		return 0;
  	if (!pargc || *pargc > 1)
  		argn = (*pargv)[1];
  	else
  		argn = NULL;
  	cctx->flags &= ~SSL_CONF_FLAG_FILE;
  	cctx->flags |= SSL_CONF_FLAG_CMDLINE;
  	rv = SSL_CONF_cmd(cctx, arg, argn);
  	if (rv > 0)
  		{
  		/* Success: update pargc, pargv */
  		(*pargv) += rv;
  		if (pargc)
  			(*pargc) -= rv;
  		return rv;
  		}
  	/* Unknown switch: indicate no arguments processed */
  	if (rv == -2)
  		return 0;
  	/* Some error occurred processing command, return fatal error */
  	if (rv == 0)
  		return -1;
  	return rv;
  	}
  
  int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
  	{
  	if (ssl_conf_cmd_skip_prefix(cctx, &cmd))
  		{
  		const ssl_conf_cmd_tbl *runcmd;
  		runcmd = ssl_conf_cmd_lookup(cctx, cmd);
  		if (runcmd)
  			return runcmd->value_type;
  		}
  	return SSL_CONF_TYPE_UNKNOWN;
  	}
  
  SSL_CONF_CTX *SSL_CONF_CTX_new(void)
  	{
  	SSL_CONF_CTX *ret;
  	ret = OPENSSL_malloc(sizeof(SSL_CONF_CTX));
  	if (ret)
  		{
  		ret->flags = 0;
  		ret->prefix = NULL;
  		ret->prefixlen = 0;
  		ret->ssl = NULL;
  		ret->ctx = NULL;
  		ret->poptions = NULL;
  		ret->pcert_flags = NULL;
  		ret->tbl = NULL;
  		ret->ntbl = 0;
  		}
  	return ret;
  	}
  
  int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
  	{
  	return 1;
  	}
  
  void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
  	{
  	if (cctx)
  		{
  		if (cctx->prefix)
  			OPENSSL_free(cctx->prefix);
  		OPENSSL_free(cctx);
  		}
  	}
  
  unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
  	{
  	cctx->flags |= flags;
  	return cctx->flags;
  	}
  
  unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
  	{
  	cctx->flags &= ~flags;
  	return cctx->flags;
  	}
  
  int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
  	{
  	char *tmp = NULL;
  	if (pre)
  		{
  		tmp = BUF_strdup(pre);
  		if (tmp == NULL)
  			return 0;
  		}
  	if (cctx->prefix)
  		OPENSSL_free(cctx->prefix);
  	cctx->prefix = tmp;
  	if (tmp)
  		cctx->prefixlen = strlen(tmp);
  	else
  		cctx->prefixlen = 0;
  	return 1;
  	}
  
  void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
  	{
  	cctx->ssl = ssl;
  	cctx->ctx = NULL;
  	if (ssl)
  		{
  		cctx->poptions = &ssl->options;
  		cctx->pcert_flags = &ssl->cert->cert_flags;
  		}
  	else
  		{
  		cctx->poptions = NULL;
  		cctx->pcert_flags = NULL;
  		}
  	}
  
  void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
  	{
  	cctx->ctx = ctx;
  	cctx->ssl = NULL;
  	if (ctx)
  		{
  		cctx->poptions = &ctx->options;
  		cctx->pcert_flags = &ctx->cert->cert_flags;
  		}
  	else
  		{
  		cctx->poptions = NULL;
  		cctx->pcert_flags = NULL;
  		}
  	}
  